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We present optical follow-up imaging obtained with the Katzman AutomaticImaging Telescope, Las Cumbres Observatory Global Telescope Network, NickelTelescope, Swope Telescope, and Thacher Telescope of the LIGO/Virgogravitational wave (GW) signal from the neutron star-black hole (NSBH) mergerGW190814. We searched the GW190814 localization region (19 deg$^{2}$ for the90th percentile best localization), covering a total of 51 deg$^{2}$ and 94.6%of the two-dimensional localization region. Analyzing the properties of 189transients that we consider as candidate counterparts to the NSBH merger,including their localizations, discovery times from merger, optical spectra,likely host-galaxy redshifts, and photometric evolution, we conclude that noneof these objects are likely to be associated with GW190814. Based on thisfinding, we consider the likely optical properties of an electromagneticcounterpart to GW190814, including possible kilonovae and short gamma-ray burstafterglows. Using the joint limits from our follow-up imaging, we conclude thata counterpart with an $r$-band decline rate of 0.68 mag day$^{-1}$, similar tothe kilonova AT 2017gfo, could peak at an absolute magnitude of at most $-17.8$mag (50% confidence). Our data are not constraining for ''red'' kilonovae andrule out ''blue'' kilonovae with $M>0.5 M_{\odot}$ (30% confidence). Westrongly rule out all known types of short gamma-ray burst afterglows withviewing angles $<$17$^{\circ}$ assuming an initial jet opening angle of$\sim$$5.2^{\circ}$ and explosion energies and circumburst densities similar toafterglows explored in the literature. Finally, we explore the possibility thatGW190814 merged in the disk of an active galactic nucleus, of which we findfour in the localization region, but we do not find any candidate counterpartsamong these sources.

The Gravity Collective: A Search for the Electromagnetic Counterpart to the Neutron Star-Black Hole Merger GW190814